SPRINGFIELD, Colo. (AP/CBS4) — Authorities say an ambulance crashed into the back of a tractor on a road outside Springfield, killing one person and injuring three others.

Colorado State Patrol officials say Friday night’s collision caused the ambulance to roll onto its top.

Officials say 63-year-old Rick Hartley of Springfield died of injuries sustained in the crash. He had been riding in the back of the ambulance. Hartley worked as a paramedic with Southeast Colorado Hospital Service and was the director at the time of his death, according to the Baca County EMS website.

The ambulance’s 74-year-old driver, Larry Miller, and 96-year-old James Wyatt, who also was riding in the back, suffered minor injuries.

The 21-year-old tractor driver also sustained minor injuries.

The cause of the crash is under investigation.

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